1.The role of saliva in the digestion of food is It moistens the food for easy swallowing. It contains a digestive enzyme called salivary amylase, which breaks down starch into sugar. It generates around2.The reason why the food tastes sweeter after chewing it for a longer time because the saliva contains “Amylase” which reacts with the starch present in the doo and CONVERTS it into glucose sugar particles which give a sweet taste to the food that we are chewing for a longer period of time.3. Hydrochloric acid (also known as stomach acid) is the main component of gastric juices produced in the stomach. It is the only acid produced by our BODIES; the other acids are the BYPRODUCTS of metabolisms.4.The reason behind you are not feeling the burning sensation in your stomach despite of HCL PRESENCE is just because of the Mucous secretion. Mucous is secreted at the gastric pits and enters the stomach to form a protective cover over the walls of the stomach.5. The cells of the villi and another PART of the small intestine, known as the crypts, transport food from the digestive tract into the bloodstream, where they can be used by the body. The villi aid in absorption by increasing the surface area of the intestine and contain specialized cells which transport different types of nutrients into the blood.